/*
    * Licensed to the Apache Software Foundation (ASF) under one or more
    * contributor license agreements.  See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * The ASF licenses this file to You under the Apache License, Version 2.0
    * (the "License"); you may not use this file except in compliance with
    * the License.  You may obtain a copy of the License at
    *
    *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package org.apache.commons.configuration2.test;
  
  import java.io.FileReader;
  import java.sql.Connection;
  import java.sql.DriverManager;
  import java.sql.SQLException;
  import java.sql.Statement;
  
  import org.apache.commons.lang3.StringUtils;
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  
  /**
   * Stolen from Turbine
   */
  
  public class HsqlDB {
      private static final Log log = LogFactory.getLog(HsqlDB.class);
      private final Connection connection;
  
      public HsqlDB(final String uri, final String databaseDriver, final String loadFile) throws Exception {
          Class.forName(databaseDriver);
  
          this.connection = DriverManager.getConnection(uri, "sa", "");
  
          if (StringUtils.isNotEmpty(loadFile)) {
              loadSqlFile(loadFile);
          }
          this.connection.commit();
      }
  
      public void close() {
          try {
              connection.close();
          } catch (final Exception e) {
          }
      }
  
      public Connection getConnection() {
          return connection;
      }
  
      private String getFileContents(final String fileName) throws Exception {
          try (FileReader fr = new FileReader(fileName)) {
  
              final char[] fileBuf = new char[1024];
              final StringBuilder sb = new StringBuilder(1000);
              int res = -1;
  
              while ((res = fr.read(fileBuf, 0, 1024)) > -1) {
                  sb.append(fileBuf, 0, res);
              }
              return sb.toString();
          }
      }
  
      private void loadSqlFile(final String fileName) throws Exception {
          try (Statement statement = connection.createStatement()) {
              String commands = getFileContents(fileName);
  
              for (int targetPos = commands.indexOf(';'); targetPos > -1; targetPos = commands.indexOf(';')) {
                  final String cmd = commands.substring(0, targetPos + 1);
                  try {
                      statement.execute(cmd);
                  } catch (final SQLException sqle) {
                      log.warn("Statement: " + cmd + ": " + sqle.getMessage());
                  }
  
                  commands = commands.substring(targetPos + 2);
              }
          }
      }
  }